The efficiency of gas injection into low-permeability multilayer hydrocarbon reservoirs

Abstract
Abstract. The efficiency of gas injection for developing terrigenous deposits within a\r\nmultilayer producing object is investigated in this article. According to the results of\r\nmeasurements of the 3D hydrodynamic compositional model, an assessment of the oil recovery\r\nfactor was made. In the studied conditions, re-injection of the associated gas was found to be\r\nthe most technologically efficient working agent.\r\nThe factors contributing to the inefficacy of traditional methods of stimulating oil production\r\nsuch as multistage hydraulic fracturing when used to develop low-permeability reservoirs have\r\nbeen analysed. The factors contributing to the inefficiency of traditional oil-production\r\nstimulation methods, such as multistage hydraulic fracturing, have been analysed when they\r\nare applied to low-permeability reservoirs.\r\nThe use of a gas of various compositions is found to be more effective as a working agent for\r\nreservoirs with permeability less than 0.005 μm2. Ultimately, the selection of an agent for\r\ninjection into the reservoir should be driven by the criteria that allow assessing the applicability\r\nof the method under specific geological and physical conditions. In multilayer production\r\nobjects, gas injection efficiency is influenced by a number of factors, in addition to\r\ndisplacement, including the ratio of gas volumes, the degree to which pressure is maintained in\r\neach reservoir, as well as how the well is operated. With the increase in production rate from\r\n60 to 90 m3 / day during the re-injection of produced hydrocarbon gas, this study found that the\r\noil recovery factor increased from 0.190 to 0.229. The further increase in flow rate to 150 m3 /\r\nday, however, led to a faster gas breakthrough, a decrease in the amount of oil produced, and a\r\ndecrease in the oil recovery factor to 0.19\r\nBased on the results of the research, methods for stimulating the formation of low-permeability\r\nreservoirs were ranked based on their efficacy.\r\nKeywords. Gas injection, Low permeability reservoir, Multilayer formation, Reservoir

Author
Hiba Hussein Alwan

DOI
https://doi.org/10.47577/technium.v3i10.5211

ISSN
ISSN: 2668-778X

Publish Date: 2022-01-24